Is your coil pack and module bad? You can check it with the Caspers ignition tester. If they are ok you don't need to replace them. Cars running in the tens on the stock stuff. I replaced mine with ones from the auto store. Most people say that only the GM ones are any good. You can get them from Kirbans, Nos4GN, etc. Not cheap. I think I spent 200 for the coil and 200 for the module. I was just replacing parts chasing a problem. Then I bought the Caspers ignition tester and determined that what I had was good. Now I have spares. Some people switch to the TR6.